cache configuration

As I've already said: It can only be the server(-side) caching. Since
revoming of the browser cache and Ctrl+F5 don't help.
But now I think, it might be an issue of the virtual machine. Because when I
edit the files directly from the VM* and not in my hosst system, sometimes I
can see the changes in the Browser.
* The files are saved in a shared folder, so I can access to them both --
from the host and also from the guest system.
Posted at Nginx Forum: http://forum.nginx.org/read.php?2,235601,235661#msg-235661